@turf/center
Advanced tools
@turf/center is a module from the Turf.js library that calculates the center of a given GeoJSON feature or set of features. It is useful for geographic data analysis and visualization, allowing developers to easily find the central point of various geometries such as polygons, lines, and multi-point collections.
Calculate Center of a Polygon
This feature calculates the center point of a polygon. The code sample demonstrates how to create a polygon and then find its center using the @turf/center package.
const turf = require('@turf/center');
const polygon = turf.polygon([[
[-81, 41],
[-81, 47],
[-72, 47],
[-72, 41],
[-81, 41]
]]);
const center = turf(polygon);
console.log(center);Calculate Center of a MultiPoint Collection
This feature calculates the center point of a collection of points (MultiPoint). The code sample shows how to create a MultiPoint collection and find its center using the @turf/center package.
const turf = require('@turf/center');
const multiPoint = turf.multiPoint([
[-81, 41],
[-81, 47],
[-72, 47],
[-72, 41]
]);
const center = turf(multiPoint);
console.log(center);Calculate Center of a LineString
This feature calculates the center point of a LineString. The code sample demonstrates how to create a LineString and find its center using the @turf/center package.
const turf = require('@turf/center');
const lineString = turf.lineString([
[-81, 41],
[-81, 47],
[-72, 47],
[-72, 41]
]);
const center = turf(lineString);
console.log(center);Geolib is a library for geospatial calculations. It provides functions to calculate distances, areas, and center points of various geometries. Compared to @turf/center, geolib offers a broader range of geospatial utilities but may not be as specialized in handling GeoJSON data.
Leaflet is a popular open-source JavaScript library for interactive maps. It includes functionalities to calculate the center of a map view or a set of coordinates. While Leaflet is primarily focused on map rendering and interaction, it can also be used for basic geospatial calculations similar to @turf/center.
Geodesy is a library for geodesic calculations, including finding the center of a set of points. It is more focused on precise geodesic computations and may offer more accuracy for certain types of geospatial data compared to @turf/center.
Takes a Feature or FeatureCollection and returns the absolute center point of all features.
Parameters
geojson GeoJSON GeoJSON to be centeredproperties [Object] an Object that is used as the Feature's propertiesExamples
var features = turf.featureCollection([
turf.point( [-97.522259, 35.4691]),
turf.point( [-97.502754, 35.463455]),
turf.point( [-97.508269, 35.463245])
]);
var center = turf.center(features);
//addToMap
var addToMap = [features, center]
center.properties['marker-size'] = 'large';
center.properties['marker-color'] = '#000';
Returns Feature<Point> a Point feature at the absolute center point of all input features
This module is part of the Turfjs project, an open source module collection dedicated to geographic algorithms. It is maintained in the Turfjs/turf repository, where you can create PRs and issues.
Install this module individually:
$ npm install @turf/center
Or install the Turf module that includes it as a function:
$ npm install @turf/turf
4.7.0
@turf/projection][projection](PR https://github.com/Turfjs/turf/pull/927 - Author @stebogit)
@turf/point-to-line-distance][point-to-line-distance]Returns the minimum distance between a {@link Point} and a {@link LineString}, being the distance from a line the minimum distance between the point and any segment of the LineString.
(PR https://github.com/Turfjs/turf/pull/925 - Author @stebogit)
@turf/boolean-within][boolean-within]Boolean-within returns true if the first geometry is completely within the second geometry. The interiors of both geometries must intersect and, the interior and boundary of the primary (geometry a) must not intersect the exterior of the secondary (geometry b). Boolean-within returns the exact opposite result of the [@turf/boolean-contains][boolean-contains].
(PR https://github.com/Turfjs/turf/pull/924 - Author @rowanwins)
@turf/unkink-polygon][unkink-polygon] testing & added flattenEach instead of using flatten.
(PR https://github.com/Turfjs/turf/pull/889)@turf/concave][concave] refactoring, replacing [@turf/union][union] with geojson-dissolve to increase speed and added support to null geometries
(PR https://github.com/Turfjs/turf/pull/907 - Contributor @stebogit @DenisCarriere)@turf/polygonize][polygonize] about "Edges must be correctly noded"
(PR https://github.com/Turfjs/turf/pull/898 - Contributor @stebogit @NickCis)@turf/clone][clone]
(PR https://github.com/Turfjs/turf/pull/904 - Contributor @DenisCarriere)GeoJSON to [@turf/simplify][simplify]
(PR https://github.com/Turfjs/turf/pull/903 - Contributor @DenisCarriere @stebogit)isNumber function and improves type checking for few [@turf/helpers][helpers] methods
(PR https://github.com/Turfjs/turf/pull/920 - Contributor @DenisCarriere @stebogit)MultiPolygons for [@turf/simplify][simplify]
(PR https://github.com/Turfjs/turf/pull/922 - Contributor @DenisCarriere)@turf/bbox-clip point intersection handling, adding sanity-checks the lineclip output
(PR https://github.com/Turfjs/turf/pull/886)@turf/line-split][line-split] endpoint case handling applying [@turf/truncate][truncate] on splitter
(PR https://github.com/Turfjs/turf/pull/892 and https://github.com/Turfjs/turf/pull/855 - Contributor @stebogit)@turf/intersect][intersect] throwing "uncaught exception", adding [@turf/truncate][truncate] to inputs and returning Feature<null> if no geometry
(PR https://github.com/Turfjs/turf/pull/890 - Contributor @stebogit @vicvolk)@turf/hex-grid][hex-grid] not properly cloning the last ring vertex
(PR https://github.com/Turfjs/turf/pull/897 - Contributor @stebogit @DenisCarriere)@turf/boolean-disjoint][boolean-disjoint] incorrect behaviour where a poly was completely contained within another poly
(PR https://github.com/Turfjs/turf/pull/908 - Contributor @rowanwins)@turf/simplify][simplify] process pending on particular geometries, applying [@turf/clean-coords][clean-coords] to input.
(PR https://github.com/Turfjs/turf/pull/903 - Contributor @stebogit @DenisCarriere)boolean properties not being translated with [@turf/clone][clone]
(PR https://github.com/Turfjs/turf/pull/909 - Contributor @DenisCarriere)@turf/boolean-contains][boolean-contains] incorrect output when checking two polygons
(PR https://github.com/Turfjs/turf/pull/923 - Contributor @rowanwins @DenisCarriere)FAQs
turf center module
The npm package @turf/center receives a total of 498,036 weekly downloads. As such, @turf/center popularity was classified as popular.
We found that @turf/center demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 9 open source maintainers collaborating on the project.
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